Motor-driven air-compressor.



A- PTEETEB AHIG.v 13,1907. E.. I). PRIEST 5.' BREW. MOTUR DRIVEN .AIRGGMPRBSSR. APPLICATION FILED Nov.2e.19o4.

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Inv-ehtors; Edward D. Peit Einem J- Bring. bg

No. 863,556. PATENTED AUG. 13, 1907. B. D. PRIEST L E. J. BRING. MOTORDRIVEN AIR COMPRESSOR.

APPLIGATON FILED NOV.26.1904.

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'UNITED srnrns EDWARD PRIEST AND EINAR J. BRING, Ol"

GENERALj ELECTRIC COMPANY FFICE.

AssIeNons To New YORK.

MOTOR-DRIVEN AIR-COMPRESSOR.

Specification of Letters Patent.

Patented Aug. 13, 1907.

Application filed November 26, 1904. Serial No. 234,378.

To all tollem lit may concern.'

l 5e it known that ,we, EDWARD DPRIEST, a citizen of the United States,and EINAR J. BRING, a subject of the l( ing of Sweden and Norway,

5 ectady, county of Schenectady, State of New York, have inventedcertain new and useful Improvements in Motor-Driven Air-Compressors, ofwhich the following is a specification.

The present invention relates to motor driven air l compressors orpumps. g

Particular attention must be given to the design of units of thischaracter in order to render them as compact as possible where they areemployed upon railway cars or in other situations affording but littlespace for p l their reception; and where the motor is geared to thecompressor or pump in order to cause the compressor to be driven at aconsiderably lower speed than the speed of the motor the difliculty ofsecuring compactness is increased.

One of the objects of the present invention is to so arrange the motorrelatively to the compresser that they are encompassed within a minimumspace.

In compressors of any character it is impracticaole to expel all ofthecompressed air from the cylinder or` cylinders at the end of thestroke of the piston and consequently at the instant the operatingcranl; of the compressorpasses the center and the piston is at the endof its compressingI stroke, the pressure of the uid is exerted, not inopposition to the motor asbefore, but in unison therewith. Therefore, ifthe connection between the l motor and the compressor consists forexample, of worm gearing, and the motor shaft possesses any materialaxial play, this 4sudden reversal of the relative directions of pressurebetween the compressed uid and the motor will tend to shift the motorshaft forcibly from lone extreme position to the other, therebyproducing a noisy and injurious hammer blow. This blow will of course berepeated when the back pressure upon the piston has been diminishedsufficiently to enable the worm to 4 0 again overhaul the teeth of theworm wheel, making two such. blows during each cycle of the piston. f

In one of its aspects the present invention contemplates means forpreventing the occurrence of noisy blows due to the reversal of therelative pressure between the fluid within the compressor cylinder andthe motor.

Further objects of the present invention will be apparent from thefollowing description of one embodiment thereof. i l

In the accompanying drawings, Figure l shows in perspective a compressorarranged in accordance with the present invention; Fig. 2 is atransverse section showing the crank shaft and driving gearing, and Fig3 is a longitudinal section showing the location o f the motor.

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l ther chamber an'olgwell ll ll is filled with lubricating oil which iscarried upwardly by -worm 2 to bearing 5 and to worm-wheel 3;

Similar reference characters will be used throughout the specificationand drawings to indicate correspondl ing parts.

The air compressor and motor maybe of any usual or preferred types,since the details thereof form no part of the present invention.

A is the air-compressor and B the motor. The shaft l of the motor isprovided with a worm 2 which meshes with a worm wheel 3 connecteddirectly with the crank-shaft 4 of the air compressor. portions of theworm and worin-wheelV are such that the actual speeds of the motor andthe compressor may be the most efficient.

for the motor is much higher than the most efficient speed of thecompressor, a comparatively large worin wheel is required, causing aconsiderable displacement of the point of application of the drivingforce from the axisl dimensions as much as possible the shaft of themotor is arranged at an incline with respect to the axis of thecompressor cylinder or cylinders c e, the 'inclina- Y The relative pro-Since the most efficient speed of the crank-shaft. In order to vlimitthe extreme being such that the motor casing b does hotpro ject to anygreat extent beyond the top or bottom of the casing a containingstheworm-wheel and the cranK- shaft. upon a `.thrust bearing 5of anysuitable character and theupper end 'within' a bearing 6'. ment' thecompressor is arranged in a The lower end of the motor shaft l is seatedBy this arrangecompact form maybe supported beneath a car body, asindicated in Fig. 3, with the cylinders horizontal without bringing anyportion, too near the ground. Furthermore by placing the motor shaftupon an incline, the back pressureof the fluid is opposed-by the weightof l:the motor armature and, in order to move themotor shaft axiallywhen the crank-shaft passes the center, the back pressure must he greatenough t0 lift the armature and shaft of the motor,-a condition whichreadily be prevented.

is formed. 11i operation, well from the .worm wheel some of'the oildrops into receptacle l0 as the wheel revolves. The oil may bedistributed by gravity from the receptacle to any point at whichlubrication is required. As the lubricant drops from the moving partsinto chamber 8 it Hows back into well l1 through a hole l2 in partition`7. The 'inclination' of the motor axis performs a furpurpose: if theaxis were horizontal, the lubricant.

A partition 7 divides the interior of the casing a into two chambers, 8and 9, within which are arranged -the @rank-shaft and the worin gearing,respectively. Within the chamber 9, and near the top thereof, thereisprovided a receptacle l0 which projects beneath the rim of theworm-wheel, while in the bottorn-ofxthe Joo would be free to-tlow alongthe shaft and into the armature of the motor; but by raising thearmature end of the Shaft this is prevented.

By the present invention a compact. and noiseless construction isobtained and one particularly adapt-ed for use in street railway workWhere tlievertical lspace Within which the compressor must. be placed isextremely limited.

Althoiighone iorin of the present. invention is illustrated in detail,we do notwish to limit the present vinvention to the details oiconstruction shown, except to the extent indicated in tlie appendedclaims..

What Weclaiin as new and desire to secure by Letters Patent of theUnited States, is,-

1. A motor driven air compressor comprising' a casing. compressorcylinders and pistons. a crank shaft from which the pistons are driven.hearings for said crank shaft in said casing. a motor in saidcasingvhaving its axis ar- 'ranged at an angle to the axes of thecylindersv a worm wheel on` the crank shaft, and a worm on the motorshaft nieshing with tht` worm wheel. the angle at which the nio-A ytorshaft and the axes of the cylinders are arranged being' such that thehack pressure of the compressor is opposed by the weight of thearmature.

2. in a motor driven air compressor, a casing having lugs thereon bywhich it may be supported, compressorcylinders and pistons thereinsupported h v said easing. a erauk shaft from which iluI pistons :iredriri-u. journal hearing-s in said easing' lor supporting;- sail crankshal'l. a luplor in said'easiug; harina its axis arranged al au aug-leto the a'x s o1' the cylinders. a woriu wheel on said rrauk shaft. aworin on .the motor shalt meshing with said worin wheel. the angle atwhich the motor shaft and axes of the cylinders are arranged heilig suchthat the hack pressure ol the compresso at the end ol the stroke isopposed by thi` weight of the armature.

Il. A' motor driven air compressor comprising a. casina. compressorcylinders and pistons mounted therein. a crank shatt from which thepistons are driven. a inotor in said casing having.;l its axis arrangedat an angle to the axes ol' the, cylinders. a worin wheel on the crankshaft. a worin on the motor shaft meshingl with said worin wheel, a stephearing in which the lower end of the motor shaft rests, an oil chainhcrsurroundn;r said worin. an oil receptacle adjacent the upper portion ofsaid worm wheel with a passage leading fr om said receptacle to the stephearing whereby oil carried up hv said worm wheel will irrigate saidstep bearing.

Inwitness whereof, we have hereunto set our hands this 25th-day ofNovember. 19H4.

EDWARD D. PRIEST. EINAR J. BRING.

Witnesses:

BENJAMIN B. HULL,- HELEN ORFORD.V

